Marouane Chamakh became City's third new signing this week when he joined the club on Tuesday.
The 32 year old former Arsenal and Crystal Palace striker has been given a short term deal until January.
"I'm so happy to be here and work with the manager again," Chamakh said. "I'm happy and proud to work with him here."
Chamakh joins Sol Bamba and Junior Hoilett as Warnock bolsters a squad second bottom of the Championship.
The ex-Bordeaux striker thinks Cardiff can improve quickly under their new manager.
"Cardiff are a side that should be on top and I think we can improve going forward," he said.
"I'm looking forward to meeting with my new team-mates and getting started. I can't wait to score for my new team."
Warnock added: "We've signed Marouane on a short-term deal until January to assess his fitness.
"He's a versatile player with pedigree and somebody who impressed me during my time at Crystal Palace."
Chamakh has made 65 international appearances for Morocco.